Small Cogeneration Unit with Heat and Electricity Storage

article in a collection out of WoS and Scopus

English

The paper describes a mathematical model of a cogeneration unit based on a three-cylinder internal combustion engine Škoda MPI 1.0-L CNG (compressed natural gas) with an output of 25 kW at 3000 rpm. It is a relatively simple engine, which is already adapted by the manufacturer to operate on CNG. The engine life and design correspond to the original purpose of use in the vehicle. The detailed dynamic model was created in the GT-Suite environment and was taken from this model into an energy balance model that includes its internal combustion engine, heat exchangers, generator, battery storage and water storage tank. The 1D internal combustion engine model provides us with information on engine start-up time, actual effective power, friction power and the amount of heat going to the cooling system and exhaust pipe. The catalytic converter was removed from the exhaust pipe and the engine is always operating at full load, thus engine power control is not considered. The model is used to optimise the design of the battery size and the heat storage for an island operation of the entire power unit for a detached house. The energy and the emission balance from the tank to the consumption of electricity and heat is carried out. Also, the service life of the engine is determined, and possible implementation of worn-out units is discussed to reach low initial system costs.

CHP, CNG, IC engine, storage

ŠTĚTINA, J.; BÖHM, M.; BŘEZINA, M.

14. 8. 2020

PRES 20

Xi'an

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